Improvement in machines for pointing blanks for cultivator-teeth



13eme effin,

JoHNPEDoERANo* Bnn, or weer PITTSBURG, PENNSYLVANIA;

` f f `iatale Paterno. hammered March 7, 1871.

I nvrPnovEli/ilahirV INMAci-missron,PoiNTiNe BLANKS Fon cuLTivAToR-TEETH.

` Thesehednle referred to in these Letters IEatenban'd part of the same.

` i Be it known that we,' ToH N' Pannen and GEORGE ABEL, of` West litftsburg, in the county yof Allegheny `and State of Pennsylvania, have inventeda newand usefulmprovementin the Manufacture of Pointed `W'ro'uglit-Metal `Blanks;and we do declare the fol-i lowing to b e a. full, clear, aud exact description there` of, reference being had to the accompanying drawing making a part of` this specification, in which` Figure vl is a plan view of our machine Without the Figure 21" aside elevation 4therecvvith apart of the frame and lower die-plate brokenaway;

'Figure 3 isa` cross-section through :zz-z, iig. 2;

Figure 4 is `a perspective view of the end of a blank `as pointed'ou our-machine;` and Figure illustrate a modication oi' the pointingdies. l, i N f` f `Likeletters of reference indicate like parts-in each. Inf thei manufacture of cultivator-teethand'other .pointed `articles made from plate or bar-ironici' steel the' blank` has heretoforebeen cut of a' rectangular 'forms-from the plate or bar, and one end olfboth ends drawn toa point by forging; or the corners of .the blank at the point end, have been sheared ofi', so as to` give a `point o'fthe desired shape. j 1 YThe foi-mer mode involves theadditional expense of reheating and forging', and the latter is objectionable on accountofthe waste material, as the parts sheared oiio are valueless-eircept for reworking` l By our improvementwe "out oli'V and point the blanks at one operation, and this we accomplish by the use of cutting and pointing-dies, which have a contour offace fronnl` the point or cutting-edge backward corresponding to `the form desired in `the point l .2 of the blank.A

Such cutters operate againstthe edge of the bar or plate, while" the latter-is inclosed on its upper and lower sides by two die-plates,V which preventthe vertical expansion or spread, While the bar or plate'from i which the blank is to be cut` is` left free to move end- `secured. tothe supports b at the proper distance apart.

` 'lhe outer sides "of thefrailsa a are grooved, so as i `to receive by a dovetail or other suitable jointas in 3, the sliding heads' Loic, Ywhich are correspondingly tongued, the object .being tov allow the sliding heads tomove back `and forth alongv the frame to and from eachother, but not up'or down nor sidewise.

ln the ends a of the frame, or in other suitable fixed support, the bearings-of the right-aid-left-hand screw c are placed, which screw is operated by a wheel, d, or other suitable device.

Each sliding hcadc has'a Atapped nut, c', securely fastened thereto, which projects-down between the ,rails a a', fig. 3, and through which the threaded screw e passes, one 'nut operating on one end ol the screw and the other on the other, so that by turning the screwthe sliding,r heads c shall be caused to approach or recede from each other.

'llieselsliding heads c carry each a cutting and pointing-die, s.

rL he cuttingand pointing-dies s being open, as in lig. l, the plate or bar g, from which the blank is to be cut, is placed on the lower die-plate h, which is ofV4 iig. 2, and properly secured.v Then, by turning the:

wheel d, the dies s are caused to approach each other, severing the baror plate g as they advance, and form- .ing a Well-shaped point on the several ends, 'as illustrated by dotted lines in fig. 1.

The top and bottom die-plates h h' prevent the up- 'ward and downward fspread of the metal of the plate `g, and the plate g/is free' to project, orA extend out lengthwise whilethe cutting is going on.-

The `dies s are then opened, the plate g fed in, and another blank is cut o and polntedin the same man, nei'. Thiswillglve blanks forl reversible teeth.

For single-pointed teeth the blank'can be made double, pointed at the ends, and afterward sheared apart at the middle.

vhdl/'e do not limit ourselves to anyT particular shape for the dies s. From the points or cutting-edges s back to the heels s they may have any desired form, such as will give in the `blank the forni ol' point desired, such as concave, convex, or straight.

For convenience, the top die-plate h may be hinged lby a pin, fn, if so desired.

ln operating the dies s We do not confine ourselves to the use of the light-and-left-hand screw, since otherV devices, such as cams, eccenti'ics, wedges, 86e., can be chanical function, and the substitution of such or sintilarly-operating devices,l we include in our invention.

The pointing dies s may also be made as illustrated in fig. 5, with a die-face, s3, back of the heel s", of any desired form, either curved, as shown, straight, inclined, or protruding forward, so as to swa'ge the edge of the blank hack of the point to any desired form.

In this way the tooth may not only be pointed, but

also its body maybe swaged bo any desired-regular or irregular Width at the saine operation; hence What We claim lierein, and desire to secure by Le` ters Patent,is-

In a machine for cutting and pointing Wroughtmetal blanks, a pair ofmovable dies, each such die having a double-beveled cutting-edge coming to a point, s', and a die-face extending therefrom of a form suitable for pointing the blank, in combination with top andbottom die-plates h h', which prevent the vertical spread of the metal, but; permit the plate and blank to move longitudinallywhile the cutting is being done, substantially as described;

In testimony whereof We', i'lhe'said JOHN PEDDEB. and GEORGE ABEL, have hereunto set our hands.

JOHN PEDDER.

* GEO. ABEL.

Witnesses: Y

LOUIS AURIN, PHILLIP HAAS. l 

